CN111059314A - A ball valve assembly and ball valve thereof - Google Patents

Abstract

The invention discloses a ball valve assembly and a ball valve thereof, wherein the ball valve assembly includes a valve body and a valve stem, and also includes a valve handle pad disposed separately from the valve body, the valve stem is provided with a handle assembly, and the valve stem passes through the valve handle The pad is connected with the handle assembly, the valve stem rotates relative to the handle pad and the valve body, a sealing ring is arranged between the lower end of the valve stem and the inner wall of the valve body, and the sealing ring is closely attached to the inner wall of the valve body and the valve stem under the action of the handle assembly. In order to achieve the sealing of the valve stem and valve body. The advantage is that the valve body and the valve handle pad are arranged separately, which simplifies the valve body structure, so that the valve body can be manufactured by a lower cost processing method; at the same time, the sealing ring is placed below, lower than the valve handle pad and the valve body. the contact surface of the valve handle to avoid leakage of the contact surface between the valve handle pad and the valve body.

Description

A ball valve assembly and ball valve thereof

technical field

The invention relates to the technical field of ball valves, in particular to a ball valve assembly and a ball valve thereof.

Background technique

At present, the structure of the ball valve widely used in the market generally includes the valve body, the valve cover, the valve core, the valve seat and the valve stem. , the cost is higher. In order to reduce the cost, it is necessary to design a new type of valve body structure and supporting components, and at the same time meet the needs of use.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies of the prior art, one of the objectives of the present invention is to provide a ball valve assembly, the valve body is easy to process, has good sealing performance, and effectively reduces the cost.

The second purpose of the present invention is to provide a ball valve, which is convenient for installation, disassembly and maintenance, and has a lower cost.

One of the objects of the present invention adopts the following technical scheme to realize:

A ball valve assembly includes a valve body and a valve stem, and also includes a valve handle pad provided separately from the valve body, the valve stem is provided with a handle assembly, and the valve stem passes through the valve handle pad and the valve handle pad. The handle assembly is connected, the valve stem rotates relative to the valve handle pad and the valve body, and a sealing ring is provided between the lower end of the valve stem and the inner wall of the valve body, and the sealing ring is installed on the handle assembly Under the action of the valve body, it is in close contact with the inner wall of the valve body and the valve stem, so as to realize the sealing of the valve stem and the valve body.

Preferably, the valve handle gasket includes a main body and a gasket, the gasket is located on the inner wall of the installation hole on the main body; the upper surface of the gasket is higher than the upper surface of the installation hole, and the upper surface of the gasket is the same as the upper surface of the installation hole. The handle assembly is fitted.

Preferably, the main body of the valve handle pad is made of metal material or hard plastic, and the gasket is made of rubber or soft plastic.

Preferably, the handle assembly includes a locking member and a handle, the locking member is a locking nut, the top end of the valve stem is provided with a thread, and the lower edge of the thread is lower than the upper surface of the valve handle pad , to provide upward force to the valve stem when the locking nut is threadedly connected to the valve stem.

Preferably, the sealing ring is a tetrafluoro gasket; the surface of the sealing ring is provided with a lubricating coating.

Preferably, the valve body is made of iron material by cold forging or red punching, or the valve body is a straight-through round tube structure, which is processed by stainless steel pipe; the valve handle pad is made of cold forging process or hot stamping Made by punching process.

Preferably, the lower part of the valve stem is provided with an annular step, the inner wall of the valve is provided with an annular groove, the annular groove is arranged corresponding to the annular step, and the sealing ring is located between the annular groove and the annular groove. between the annular steps, and respectively abut against the annular groove and the annular step.

Preferably, a positioning portion for positioning the handle is provided on the outer side of the valve handle pad.

The second purpose of the present invention adopts the following technical scheme to realize:

A ball valve, comprising the above-mentioned ball valve assembly, and also comprising a valve core and a valve cover; the valve core is arranged in a valve body and rotates relative to the valve body under the drive of a valve stem, the valve cover and the valve core A first sealing gasket is arranged therebetween; a second sealing gasket is arranged between the valve cover and the valve body.

Preferably, the valve body is a straight-through circular tube structure, and the number of the valve covers is two, which are respectively connected with the valve body by threads.

Compared with the prior art, the beneficial effects of the present invention are:

The invention separates the valve body and the valve handle pad on it, simplifies the structure of the valve body, enables the valve body to be manufactured with a higher precision and lower cost processing technology, improves the quality of the ball valve, and can use a lower cost ball valve. Made of materials, the cost is greatly reduced; at the same time, the seal between the valve stem and the valve body is set at the lower end of the valve stem, and the sealing surface is lower than the valve stem hole on the valve body, so that the medium in the valve body will not leak from the valve stem hole. ;When the handle assembly compresses the valve handle pad, it provides upward force on the valve stem, thereby squeezing the sealing ring to achieve the sealing between the valve stem and the valve body. The valve stem cannot be rotated after the component is pressed against the valve handle pad, the valve stem drives the valve core to rotate to realize the opening and closing of the ball valve.

Description of drawings

1 is a schematic diagram of an explosion structure of a ball valve assembly according to Embodiment 1 of the present invention;

2 is a schematic structural diagram of a valve body according to Embodiment 1 of the present invention;

3 is a schematic structural diagram of a ball valve according to Embodiment 1 of the present invention;

4 is a schematic structural diagram of the valve handle pad according to the first embodiment of the present invention;

5 is a schematic structural diagram of the valve handle pad according to the second embodiment of the present invention;

6 is a schematic structural diagram of a ball valve according to Embodiment 2 of the present invention;

7 is a schematic diagram of the explosion structure of the ball valve according to the second embodiment of the present invention;

8 is a schematic structural diagram of a ball valve according to Embodiment 3 of the present invention;

FIG. 9 is a schematic structural diagram of a ball valve according to Embodiment 3 of the present invention.

In the figure: 1, valve handle pad; 11, body; 12, mounting hole; 13, lower mounting surface; 14, top surface; 15, gasket; 16, annular boss; 17, bump; 2, valve body; 21 , valve stem hole; 22, annular groove; 23, positioning groove; 24, extension part; 3, valve stem; 31, sealing ring; 32, annular step; 33, plug-in part; 4, handle assembly; 41, handle ; 42, lock nut; 43, positioning column; 5, valve core; 51, first gasket; 52, slot; 6, valve cover; 61, second gasket; 62, annular groove.

Detailed ways

The present invention will be described in more detail below with reference to the accompanying drawings. It should be noted that the following description of the present invention with reference to the accompanying drawings is only illustrative and not restrictive. The various embodiments may be combined with each other to form other embodiments not shown in the following description.

In the description of the present invention, it should be noted that, for orientation words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "upper", "lower" , "Front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise" ” etc. indicating the orientation and positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or a specific orientation. The structure and operation should not be construed as limiting the specific protection scope of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or indicating the number of technical features. Thus, the definition of "first" and "second" features may expressly or implicitly include one or more of the features, and in the description of the present invention, "several" means two or more, unless otherwise There are clear and specific restrictions.

In the present invention, unless otherwise expressly specified and limited, the terms "assembled", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integrated It can be connected to the ground; it can also be a mechanical connection; it can be directly connected, or it can be connected through an intermediate medium, or the two components can be connected internally. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

Referring to Figures 1 to 9, the ball valve assembly and the ball valve of the embodiment of the present invention will be clarified in the following description, wherein the valve body and the valve handle pad are arranged separately, which simplifies the valve body structure and makes the valve body The valve body can be manufactured by a lower cost processing method; at the same time, the sealing ring is placed below the contact surface of the valve handle pad and the valve body to avoid leakage of the contact surface between the valve handle pad and the valve body.

Most of the existing ball valve bodies, including copper ball valves and cast iron ball valves, are generally manufactured by metal mold casting due to structural limitations, and then clamped for processing. The process is cumbersome, and there are certain defects in metal mold casting itself. The valve body may have problems such as shrinkage holes and shrinkage porosity, and the mechanical properties are poor, making it difficult to meet the requirements of use. In order to solve the above problems and make the valve body can be processed by a squeeze casting process with higher precision and lower cost, the present invention designs a new type of ball valve assembly, the specific structure of which will be described below.

As shown in Figures 1 to 9, the ball valve assembly of the present invention includes a valve body 2 and a valve stem 3, and also includes a valve handle pad 1 that is provided separately from the valve body 2. The valve stem 3 is provided with a handle assembly 4, and the valve stem 3 is connected to the handle assembly 4 through the valve handle pad 1, the valve stem 3 rotates relative to the valve handle pad 1 and the valve body 2, a sealing ring 31 is provided between the lower end of the valve stem 3 and the inner wall of the valve body 2, and the sealing ring 31 is in the handle Under the action of the component 4, it is in close contact with the inner wall of the valve body 2 and the valve stem 3, so as to realize the sealing between the valve stem 3 and the valve body 2.

The cold heading process is one of the new pressure machining processes for less and less cutting metals. It is a processing method that utilizes the plastic deformation of metal under the action of external force, and redistributes and transfers the metal volume with the aid of a mold, thereby forming the required parts or blanks. "Red Chong" is actually a hot extrusion process, which is a processing process with little or no cutting. The surface roughness is close to that of the die, and the dimensional accuracy can reach 6-7 grades. The parts are of good quality and suitable for mass production. Compared with the existing cast ball valve, the ball valve of the present invention adopts the cold heading process or the "red punching" process, which can reduce the cost of the iron ball valve of the same size to 50% of the existing cast ball valve. The valve body of the three-piece ball valve is directly cut by stainless steel pipe, which can further reduce the cost and ensure that the overall performance of the ball valve is much better than the existing cast ball valve.

The present invention separates the valve body 2 from the valve handle pad 1, so that the outer surface of the valve body 2 has no protrusions, and the whole has a round tubular structure, which is suitable for the cold heading process or the "red punching" process. After the valve body 2 and the valve handle are completed After the pad 1 is processed separately, it can be directly assembled with the valve stem 3 and the handle assembly 4 . More specifically, after the lower part of the valve stem 3 is covered with the sealing ring 31, it passes through the valve stem hole 21, and the sealing ring 31 is in contact with the inner wall of the valve body 2; The outer surface of the body 2 is abutted, and then the handle assembly 4 is assembled on the top of the valve stem 3 and locked. The handle assembly 4 is abutted against the valve handle pad 1, and the valve stem 3 The lower end of the valve stem 3 and the inner wall of the valve body 2 clamp the sealing ring 31, and the sealing ring 31 is squeezed and deformed to realize the sealing between the valve stem 3 and the valve body 2. At the same time, the sealing ring 31 can lubricate the valve stem. 3 can be rotated under the action of the handle assembly 4 to ensure the normal use of the ball valve. Preferably, the sealing ring 31 is a PTFE gasket, which has the characteristics of high temperature resistance and high pressure resistance, wear resistance, and low friction coefficient, which is convenient for the valve stem 3 to rotate. More specifically, the tetrafluoro gasket used in the present invention is an expanded tetrafluoro gasket. Preferably, liquid silica gel can also be smeared on the surface of the PTFE pad as a lubricating coating to further reduce the friction system. Dip the PTFE pad with liquid silicone, and then remove the PTFE pad during assembly.

For the convenience of description, the present invention uses the same type of valve handle gasket 1 ball valve assembly and its ball valve as the same embodiment, and other structures can be regarded as common structures of other embodiments. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.

Example 1

The pad of the valve stem 3 in this embodiment has an earless structure, that is, there is no positioning portion on the outside of the pad of the valve stem 3 .

As shown in FIG. 1 , FIG. 3 and FIG. 4 , the valve stem 3 gasket of this embodiment includes a body 11 and a washer 15 , and the washer 15 is located on the inner wall of the mounting hole 12 on the body 11 ; the upper surface of the washer 15 is higher than The upper surface of the mounting hole 12 and the upper surface of the washer 15 are fitted with the handle assembly 4 . The washer 15 in this embodiment is arranged in the installation hole 12 , the inner diameter of the washer 15 is equivalent to the valve stem 3 , and the upper surface of the washer 15 is higher than the top surface 14 , and is used to fit with the lower surface of the handle 41 , and is driven by the handle 41 . When the valve stem 3 is rotated, the lower surface of the handle 41 is in contact with the gasket 15 instead of the top surface 14 of the body 11 . The gasket 15 can be a conventional gasket 15 on the market. The handle assembly 4 includes a handle 41 and a locking member. In order to simplify the design, a locking nut 42 can be used as the locking member, or other locking structures can be used. When the locking member is the locking nut 42, the top of the valve stem 3 is provided with a thread, and the lower edge of the thread is lower than the upper surface of the valve handle pad 1. When the locking nut 42 is threadedly connected with the valve stem 3, the locking nut 42 abuts against the upper surface of the valve handle pad 1 and continues to rotate to provide upward force to the valve stem 3 .

The main purpose of arranging the gasket 15 in the mounting hole 12 is that the valve stem 3 and the handle 41 are generally made of metal materials. When rotating, the friction between the handle 41 and the body 11 made of rigid material is relatively large, and the tightness of the locking nut 42 is not easy to control. Once the locking nut 42 is tightened a little, the handle 41 cannot drive the valve stem 3 to rotate. The requirements for ball valve assembly are high; after adding the washer 15, due to the lubricating effect of the washer 15 between the valve stem 3 and the body 11, that is, the lock nut 42 is tightened tightly, and the handle 41 can also easily drive the valve stem 3. At the same time, since the lock nut 42 is tightened more tightly, the seal between the valve stem 3 and the valve body 2 is also firmer. Preferably, the washer 15 is in line contact with the handle 41, the frictional force is smaller, and the rotation of the valve stem 3 is less labor-intensive.

In this embodiment, the lock nut 42 rotates with the valve stem 3 and the handle 41, and the valve handle pad 1 is fixed relative to the valve body 2. Therefore, the lower surface of the lock nut 42 and the valve handle pad 1 rotate relative to each other. After long-term use , the locking nut 42 may be loose, therefore, preferably, the locking nut 42 is a self-locking nut, and the self-locking nut used can be purchased directly in the market and used directly. The specific structure will not be repeated here, as long as the locking nut is guaranteed 42 After the assembly is completed, it is sufficient that it does not rotate relative to the valve stem 3.

Because the gasket 15 is generally made of deformable material, under the pressure of the lock nut 42, it is easy to be flattened and expanded outwards, so that the inner diameter of the gasket 15 is larger than the diameter of the valve stem 3, resulting in poor sealing between the gasket 15 and the valve stem 3. At the same time, the gasket 15 is also easily deformed and damaged due to thermal expansion and cold contraction; in this embodiment, the gasket 15 is arranged in the body 11, and the body 11 restricts the deformation of the gasket 15, while protecting the gasket 15, not only The sealing between the gasket 15 and the valve stem 3 is strengthened, and deformation and damage of the gasket 15 due to thermal expansion and contraction are also avoided. In addition, since the washer 15 is generally made of deformable material and has a certain elasticity, after the lock nut 42 is tightened, the washer 15 is compressed, thereby generating upward force on the lock nut 42 and the handle 41, and at the same time, on the valve stem. 3. An upward pulling force is generated, so that the lower end of the valve stem 3 squeezes the sealing ring 31, which further enhances the sealing between the valve stem 3 and the valve body 2.

In this embodiment, the body 11 can be made of metal material or hard plastic that is not easily deformed, and the gasket 15 is made of rubber or soft plastic. The reason why the body 11 of this embodiment can be made of rigid plastic is that the gasket 15 is added. Therefore, the body 11 made of rigid plastic is not in direct contact with the handle 41 and is not easy to wear. At the same time, due to the limitation of the double-layer structure, rigid plastic is used. The deformation of the body 11 and the gasket 15 during thermal expansion and contraction is smaller. More specifically, the body 11 can be made of metal materials such as iron, aluminum, copper, and stainless steel that are not easily deformed, and can also be made of hard plastics such as low-pressure polyethylene and polyvinyl chloride that are not easily deformed. The gasket 15 can be made of polydietherketone (PEEK), Deweilon, para-polyphenylene (PPL), polytetrafluoroethylene (PTFE), a mixed material of PTFE and graphite, nylon and other materials.

In addition, there are various positioning structures between the washer 15 and the body 11. One is that an annular boss 16 is provided on the side wall of the mounting hole 12, the lower surface of the washer 15 is in contact with the annular boss 16, and the annular boss 16 is opposite to the washer. 15 plays a limiting role, and the lower mounting surface 13 of the main body 11 is in contact with the outer surface of the valve body 2. At this time, the lower mounting surface 13 of the main body 11 can be the curved surface in the first embodiment, or can be as in the second embodiment. The other is that the diameter of the mounting hole 12 is consistent with the outer diameter of the washer 15, the washer 15 completely penetrates the body 11, and the lower surface of the washer 15 is flush with the lower mounting surface 13 of the body 11, then the lower surface of the body 11 The mounting surface 13 and the lower surface of the gasket 15 are in close contact with the outer surface of the valve body 2 at the same time.

The lower mounting surface 13 of this embodiment may be a curved surface, which corresponds to the curved surface of the outer surface of the valve body 2. Under the action of the handle assembly 4, the lower mounting surface 13 of the valve handle pad 1 is in close contact with the surface of the valve body 2. The lower mounting surface 13 in this embodiment can also be a plane. In this case, in order to make the lower mounting surface 13 fit with the outer surface of the valve body 2, a plane mounting surface is machined on the surface of the valve body 2, and the valve handle pad 1 is arranged on a plane surface. In the installation surface, it plays the role of positioning and limiting the valve handle pad 1. The valve body 2 is provided with a valve stem hole 21 for the valve stem 3 to pass through. Regardless of whether the lower mounting surface 13 is a curved surface or a flat surface, the valve stem hole 21 and the mounting hole 12 are concentrically arranged to ensure that the valve stem 3 rotates vertically, so that the The seal between the valve stem 3 and the valve body 2 is more stable, avoiding leakage.

In this embodiment, in order to install the sealing ring 31, the lower part of the valve stem 3 is provided with an annular step 32, the inner wall of the valve body 2 is provided with an annular groove 22, the annular groove 22 is correspondingly arranged with the annular step 32, and the sealing ring 31 is located in the annular Between the groove 22 and the annular step 32, and abut against the annular groove 22 and the annular step 32 respectively. More specifically, the sealing ring 31 is sleeved on the valve stem 3, the lower surface is in contact with the annular step 32, and the upper surface is in contact with the annular groove 22. During the assembly process, due to the upward pulling force of the locking screw, the annular step 32 is the same. Slightly move up, press the sealing ring 31, and the sealing ring 31 is properly deformed, so as to realize the sealing between the valve stem 3 and the valve body 2. Compared with the sealing of the middle side of the valve stem 3 in the prior art, this embodiment not only places the sealing surface down, and becomes a combination of a horizontal seal and a side seal to prevent impurities or water from entering the lower end of the valve stem 3, but also strengthens the sealing of the valve. The positioning of the rod 3 itself connects the handle assembly 4 and the valve stem 3 more closely, instead of using the lock nut 42 to fix the handle 41 on the valve stem 3 as in the prior art, the lock nut 42 is used An upward pulling force is generated on the valve stem 3, the deformation and sealing of the sealing ring 31 are strengthened, the valve stem 3 is not easy to loosen, and the sealing effect is better.

In this embodiment, the cooperation between the sealing ring 31 and the annular step 32 is particularly important. In order to prevent the annular step 32 from cutting the lower surface of the sealing ring 31 when the valve stem 3 rotates, the annular step 32 and the annular groove 22 are in contact with the sealing ring 31 . For surface contact, more specifically, the upper surface of the annular step 32 is a horizontal plane, and the bottom wall of the annular groove 22 is also a horizontal plane, which is parallel to the upper surface of the annular step 32 and has a width greater than or equal to the width of the sealing ring 31 . As shown in FIG. 3 , the initial width of the sealing ring 31 may be slightly smaller than the width of the annular step 32 and the annular groove 22 . After the assembly is completed, the sealing ring 31 is squeezed and deformed and properly flattened, thereby making the sealing ring 31 The width is close to or equal to the width of the annular step 32 and the annular groove 22 . Since the valve body 2 is of a round tube structure and the wall of the valve body 2 is relatively thin, it is necessary to pay attention to the diameter of the groove on the inner wall of the valve body 2 to avoid that the wall of the valve body 2 corresponding to the annular groove 22 is too thin and the strength is not up to standard. Therefore, the width of the annular groove 22 is preferably 2 mm to 3 mm, the width of the annular step 32 is preferably 2 mm to 3 mm, and the width of one side of the sealing ring 31 is 1.8 mm to 2.5 mm. Considering the strength and cost of the sealing ring 31, this The width of one side of the sealing ring 31 of the embodiment is 2 mm. After testing, the existing side-sealed ball valve is severely worn on the sealing surface after 300 rotations, and the valve stem is slightly shaken; the ball valve of the present invention remains vertical after 700 rotations, the connection is firm, and the sealing surface does not leak.

As shown in Figures 1 to 3, in order to limit the rotation angle of the handle 41, a positioning column 43 is provided on the handle 41. The length of the positioning column 43 is greater than the height of the valve handle pad 1, and the corresponding position on the surface of the valve body 2 is set. There is a positioning groove 23, and the positioning column 43 cooperates with the positioning groove 23 to locate the handle 41 and the valve stem 3. When the lower end of the positioning column 43 is located in the positioning groove 23, the hand can no longer rotate in the original direction; because the valve body 2 is a round tube Type, the positioning groove 23 can be directly formed on the surface of the valve body 2 by cutting, one side is higher, the other side is lower to form an opening, the positioning column 43 can enter and exit the positioning groove 23 from the opening, and the position of the positioning groove 23 defines the handle 41 angle of rotation. Due to the different application places of the ball valve, the space size of the installation location is also different. In order to use the installation space of different sizes, the height of the valve handle pad 1 has various specifications, and the valve handle pad 1 suitable for the height can be selected according to the size of the installation location. At the same time, The length of the positioning column 43 on the handle 41 also has various specifications, and the valve body 2 with different positions of the positioning groove 23 and the corresponding handle 41 can be selected according to the limited rotation angle. As shown in FIG. 1 , for the place where the installation space is large and the rotation angle of the handle 41 is required to be large, the handle 41 with the short positioning column 43 can be selected, and the valve body with the positioning groove 23 located at the top of the side of the valve body 2 can be selected. 2. In addition, in order to limit the rotation angle of the handle 41, the number of the positioning posts 43 on the handle 41 is two, which are distributed on the side of the handle 41 at right angles; Valve body 2 surface.

The ball valve corresponding to this embodiment can be a one-piece ball valve, a two-piece ball valve and a three-piece ball valve. The ball valve shown in FIG. 3 is a two-piece ball valve, including a valve core 5 and a valve cover 6; the valve core 5 It is arranged in the valve body 2 and rotates relative to the valve body 2 under the drive of the valve stem 3. A first sealing gasket 51 is arranged between the valve cover 6 and the valve core 5; The second gasket 61 . The valve cover 6 is threadedly connected with the valve body 2; the side of the valve cover 6 facing the valve body 2 is provided with an annular groove 62, the annular groove 62 is located behind the sealing thread on the valve cover 6, and the second gasket 61 is located in the annular groove 62, And higher than the annular groove 62, after the valve cover 6 and the valve body 2 are screwed tightly, the side surface of the valve body 2 is deformed to offset. The valve cover 6 of the two-piece ball valve and the three-piece ball valve are installed in the same manner. The following takes the two-piece ball valve as an example to describe the installation process of the valve cover 6 in detail.

As shown in FIG. 3 , the valve cover 6 is connected with one end of the valve body 2 by screws. In order to ensure the sealing performance of the valve core 5, a first gasket 51 is provided between the valve cover 6 and the valve core 5; A sealing gasket 51 is a PTFE ring, which protrudes toward the side of the valve core 5 and closely fits with the valve core 5; at the same time, in order to ensure the sealing connection between the valve cover 6 and the valve body 2, the valve cover 6 and the valve body 2 There is a second gasket 61 between them, and in order to install and position the second gasket 61, the side of the valve cover 6 facing the valve body 2 is provided with an annular groove 62, and the annular groove 62 is located behind the sealing thread on the valve cover 6. The two sealing gaskets 61 are located in the annular groove 62 and are higher than the annular groove 62 . When installing, first install and position the valve stem 3 and the valve body 2, and then put the valve core 5 into the valve body 2. The size of the valve core 5 is smaller than the inner diameter of the valve body 2, so as to facilitate the matching between the bottom of the valve stem 3 and the valve core 5. Insert; then place the two second gaskets 61 on both sides of the valve core 5, and the protruding side is attached to the valve core 5. Since the first gasket 51 has a certain thickness, the valve core 5 is attached to the valve core 5. The core 5 is raised to a certain height, the plug-in portion 33 at the bottom of the valve stem 3 is inserted into the slot 52 at the top of the valve core 5, and the valve core 5 will rotate with the valve stem 3; put the second gasket 61 into the annular groove 62 to carry out After pre-positioning, screw the valve cover 6 to the valve body 2. The valve cover 6 presses the first gasket 51 to further clamp the valve core 5 to prevent leakage. At the same time, the second gasket 61 and the valve body 2 The two ends are close to each other. The two ends of the valve body 2 are provided with extension parts 24. The extension parts 24 extend towards the direction of the valve cover 6 and press the second gasket 61 during the tightening process of the valve cover 6. The extension parts 24 and the annular groove 62 are formed. The “L”-shaped groove and the second sealing gasket 61 are squeezed and deformed to further enhance the sealing performance between the valve cover 6 and the valve body 2 .

Figure 2 shows the structure of the valve body 2 of the three-piece ball valve. In a specific embodiment, the ball valve is a three-piece structure, including a straight-through cylindrical valve body 2 and two valve covers 6. There are no protrusions in the valve body 2, so cold heading process or red punching can be used more conveniently. The two valve covers 6 and the valve body 2 have the same structure, or in other words, the two valve covers 6 have the same structure, which simplifies the manufacturing process. When assembling, first Install the valve stem 3, the sealing ring 31, the valve handle pad 1 and the handle assembly 4, and then the installation steps are the same as the two-piece ball valve, just install the valve core 5 and the two valve covers 6. Preferably, in order to further reduce the cost, the valve body 2 in the three-piece ball valve can be directly processed by using a stainless steel tube.

Embodiment 2

In this embodiment, a positioning portion for positioning the handle 41 is provided on the outer side of the valve handle pad 1 . More specifically, as shown in FIG. 5 to FIG. 17. The number of bumps 17 is one, and the valve handle pad 1 is a single-ear structure. The handle 41 in the handle assembly 4 is provided with a positioning column 43, when the handle 41 is rotated, the positioning column 43 will be blocked by the protrusion 17, thereby limiting the rotation angle of the handle 41. The surface of the valve stem 3 may not be provided with the positioning groove 23 , and the length of the positioning column 43 may not be greater than the height of the valve handle pad 1 , and the positioning column 43 may only be limited by the protrusion 17 . At this time, the number of the positioning columns 43 is two, and the rotation angle of the handle 41 can be limited by the included angle between the two positioning columns 43. The included angle between the two positioning columns 43 is 90°, corresponding to the valve core 5 Fully open and fully closed rotation angles.

Embodiment 3

In this embodiment, a positioning portion for positioning the handle 41 is provided on the outer side of the valve handle pad 1 . More specifically, as shown in FIG. 8 , the positioning portion is a convex block 17 arranged on the outer side of the valve handle cushion 1 , and the number of the convex block 17 is For two, the valve handle pad 1 is a binaural structure. The handle 41 in the handle assembly 4 is provided with a positioning column 43 . When the handle 41 is rotated, the positioning column 43 will be blocked by the protrusion 17 , thereby limiting the rotation angle of the handle 41 . As shown in the figure, the bumps 17 are symmetrically arranged on both sides of the outer wall of the valve handle pad 1, and the number of the positioning posts 43 is two. Closed rotation angle.

In other embodiments, the valve handle pad 1 can also adopt a structure including a cylindrical body 11 without a washer 15 , the mounting hole 12 penetrates through the body 11 , and the diameter of the mounting hole 12 is equivalent to the valve stem 3 . In order to ensure the strength of the main body 11, the main body 11 is integrally formed with a metal material. More specifically, the metal material can be a material that is not easily deformed, such as iron, aluminum, copper, and stainless steel. The body 11 can be made of iron material by cold heading or red punching, and the cost is low. At this time, the top surface 14 of the main body 11 is the contact surface with the handle 41 of the ball valve, the handle 41 and the locking nut 42 are sleeved on the top of the valve stem 3, the lower surface of the locking nut 42 is in contact with the upper surface of the handle 41, and the handle The lower surface of 41 is in contact with the top surface 14 of the main body 11. By adjusting the tightness of the locking nut 42, the handle 41 can drive the valve stem 3 to rotate, and the valve stem 3 does not leak water, and the lower mounting surface 13 is tightly connected to the surface of the valve body 2. paste. The lower mounting surface 13 of the valve handle pad 1 can be a curved surface or a flat surface; it can be an earless structure, a single-ear structure, or a binaural structure, as described in the above embodiments.

The above-mentioned embodiments are only preferred embodiments of the present invention, and cannot be used to limit the scope of protection of the present invention. Any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention belong to the scope of the present invention. Scope of protection claimed.

Claims (10)

1. The utility model provides a ball valve subassembly, includes valve body and valve rod, its characterized in that, still include with the valve handle pad that the valve body components of a whole that can function independently set up, be equipped with handle assembly on the valve rod, the valve rod passes the valve handle pad with handle assembly connects, the valve rod is relative the valve handle pad with the valve body rotates, the valve rod lower extreme with be equipped with the sealing washer between the inner wall of valve body, the sealing washer is in under handle assembly's the effect with the valve body inner wall with the valve rod is hugged closely, in order to realize the valve rod with the sealing of valve body.

2. The ball valve assembly of claim 1, wherein: the valve handle pad comprises a body and a gasket, and the gasket is positioned on the inner wall of the mounting hole on the body; the upper surface of packing ring is higher than the upper surface of mounting hole, the upper surface of packing ring with the laminating of handle components.

3. The ball valve assembly of claim 2, wherein: the valve handle pad is characterized in that a body of the valve handle pad is made of metal materials or hard plastics, and a gasket is made of rubber or soft plastics.

4. A ball valve assembly as claimed in claim 1, 2 or 3, wherein: the handle assembly comprises a locking piece and a handle, the locking piece is a locking nut, threads are arranged on the top end of the valve rod, and the lower edge of each thread is lower than the upper surface of the valve handle pad, so that the locking nut is in threaded connection with the valve rod and provides upward force for the valve rod.

5. A ball valve assembly as claimed in claim 1, 2 or 3, wherein: the sealing ring is a PTFE pad; and a lubricating coating is arranged on the surface of the sealing ring.

6. A ball valve assembly as claimed in claim 1, 2 or 3, wherein: the valve body is made of an iron material through cold forging or hot stamping, or the valve body is of a straight-through round tube type structure and is processed through a stainless steel tube; the valve handle pad is manufactured by adopting a cold forging process or a hot stamping process.

7. A ball valve assembly as claimed in claim 1, 2 or 3, wherein: the lower part of the valve rod is provided with an annular step, the inner wall of the valve body is provided with an annular groove, the annular groove corresponds to the annular step, and the sealing ring is positioned between the annular groove and the annular step and respectively abutted against the annular groove and the annular step.

8. A ball valve assembly as claimed in claim 1, 2 or 3, wherein: and a positioning part for positioning the handle is arranged on the outer side of the valve handle pad.

9. A ball valve, characterized in that: a ball valve assembly including a valve as claimed in any one of claims 1 to 8, further comprising a valve spool and a valve cover; the valve core is arranged in the valve body and driven by the valve rod to rotate relative to the valve body, and a first sealing gasket is arranged between the valve cover and the valve core; and a second sealing gasket is arranged between the valve cover and the valve body.

10. The ball valve of claim 9, wherein: the valve body is of a straight-through circular tube type structure, and the number of the valve covers is two, and the two valve covers are respectively in threaded connection with the valve body.

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